The ZX Interface 2 followed in the Sinclair tradition of simple design but fell short of its potential. It had a number of points against it that made it a weak addition to the ZX Spectrum:
- The ROM cartridges were limited to 16K in size
- There was no paging mechanism to access the ZX Spectrum or ZX Interface 1 ROMs
- The through edge connector only supported the ZX Printer
- There was no safety mechanism to prevent ROM cartridges being inserted or removed whilst the power was on
- The ROM cartridges were expensive compared to cassette based software
- The ZX Interface 2 was expensive for the features it provided
In constrast, the capabilities and possibilities provided by the ZX Interface 1 were far greater, and it is a shame that the features of the ZX Interface 2 were not incorporated into the ZX Interface 1.